ENGINE IDENTIFICATION

The engine identification code consists of the engine assembly plant, the engine assembly date, and a 2 or 3 letter suffix indicating the cubic inch displacement, the horsepower rating, and generally, what type of transmission was to be installed with the engine. Manual transmissions required a bushing in the rear of the bellhousing where an automatic transmission did not. Many engine "accessories" such as the carburetor, distributor, and exhaust manifolds were not installed at the engine assembly plant but rather at the final assembly plant.

T = Tonawanda Engine Plant
0712 = July 12
ED = 396/325 L35 Manual 3/4-speed

Engine Assembly Plant - 1st letter

CodeAssembly Plant
 VFlint, Michigan
*TTonawanda Engine Plant
  
Assembly Month - 1st and 2nd numbers
NumberMonthNumberMonth
01January02February
03March04April
05May06June
*07July08August
09September15October
11November12December
    

Assembly Day - 3rd and 4th numbers
01...31
 

Engine

Transmission

Notes

CodeSizeHP 
BA230-1140Manual-3Overdrive
BB230-1140Manual-3Heavy Duty Clutch/A.C.
BC230-1140Manual-3Heavy Duty Clutch
BD230-1140Manual-3A.C.
BF230-1140Powerglide 
BH230-1140PowerglideA.C.
250 ↓    
CM250-1155-L22Manual-3Overdrive
CN250-1155-L22Manual-3A.C.
CQ250-1155-L22Powerglide 
CR250-1155-L22PowerglideA.C.
307 ↓    
DA307-2200Manual-3Overdrive
DB307-2200Manual-4 
DE307-2200Powerglide 
DF307-2200Powerglide 
DN307-2200Manual-3Heavy Duty Clutch
327 ↓    
EA327-4275-L30Manual-3/4 
EC327-4275-L30Powerglide 
EE327-4275-L30Powerglide 
EH327-4250-L73Manual-3/4 
EI327-4250-L73Powerglide 
EJ327-4250-L73Manual-3Heavy Duty Clutch/L73
EO327-4275-L30Manual-3Heavy Duty Clutch
EP327-4325-L79Manual-3/4Spcl High Perf
ES327-4325-L79Manual-3Spcl High Perf/Heavy Duty Clutch
396 ↓    
*ED396-4325-L35Manual-3/4 
EF396-4350-L34Manual-3/4 
EG396-4375-L78Manual-3/4 
EK396-4325-L35Powerglide 
EL396-4350-L34Powerglide 
ET396-4325-L35TH-400 
EU396-4350-L34TH-400